LOCAL bool RF24_sendMessage(const uint8_t recipient, const void* buf, const uint8_t len)
{
uint8_t RF24_status;
RF24_stopListening();
RF24_openWritingPipe( recipient );
RF24_DEBUG(PSTR("RF24:SND:TO=%d,LEN=%d\n"),recipient,len); // send message
// flush TX FIFO
RF24_flushTX();
// this command is affected in clones (e.g. Si24R1): flipped NoACK bit when using W_TX_PAYLOAD_NO_ACK / W_TX_PAYLOAD
// AutoACK is disabled on the broadcasting pipe - NO_ACK prevents resending
RF24_spiMultiByteTransfer(recipient == BROADCAST_ADDRESS ? RF24_WRITE_TX_PAYLOAD_NO_ACK :
RF24_WRITE_TX_PAYLOAD, (uint8_t*)buf, len, false );
// go, TX starts after ~10us
RF24_ce(HIGH);
// timeout counter to detect HW issues
uint16_t timeout = 0xFFFF;
do {
RF24_status = RF24_getStatus();
} while (!(RF24_status & ( _BV(RF24_MAX_RT) | _BV(RF24_TX_DS) )) && timeout--);
// timeout value after successful TX on 16Mhz AVR ~ 65500, i.e. msg is transmitted after ~36 loop cycles
RF24_ce(LOW);
// reset interrupts
RF24_setStatus(_BV(RF24_TX_DS) | _BV(RF24_MAX_RT) );
// Max retries exceeded
if(RF24_status & _BV(RF24_MAX_RT)) {
// flush packet
RF24_DEBUG(PSTR("!RF24:SND:MAX_RT\n")); // max retries, no ACK
RF24_flushTX();
}
RF24_startListening();
// true if message sent
return (RF24_status & _BV(RF24_TX_DS));
}
LOCAL uint8_t RF24_readMessage( void* buf) {
const uint8_t len = RF24_getDynamicPayloadSize();
RF24_DEBUG(PSTR("RF24:read message, len=%d\n"), len);
RF24_spiMultiByteTransfer( R_RX_PAYLOAD , (uint8_t*)buf, len, true );
// clear RX interrupt
RF24_setStatus(_BV(RX_DR) );
return len;
}
LOCAL uint8_t RF24_getDynamicPayloadSize(void) {
uint8_t result = RF24_spiMultiByteTransfer(R_RX_PL_WID, NULL, 1, true);
// check if payload size invalid
if(result > 32) {
RF24_DEBUG(PSTR("RF24:invalid payload length = %d\n"),result);
RF24_flushRX();
result = 0;
}
return result;
}
LOCAL uint8_t RF24_getDynamicPayloadSize(void)
{
uint8_t result = RF24_spiMultiByteTransfer(RF24_READ_RX_PL_WID, NULL, 1, true);
// check if payload size invalid
if(result > 32) {
RF24_DEBUG(PSTR("!RF24:GDP:PAYL LEN INVALID=%d\n"),result); // payload len invalid
RF24_flushRX();
result = 0;
}
return result;
}
LOCAL uint8_t RF24_RAW_writeByteRegister(const uint8_t cmd, uint8_t value)
{
RF24_DEBUG(PSTR("RF24:write register, reg=%d, value=%d\n"), cmd & RF24_REGISTER_MASK, value);
return RF24_spiMultiByteTransfer( cmd , &value, 1, false);
}
LOCAL uint8_t RF24_RAW_readByteRegister(const uint8_t cmd)
{
const uint8_t value = RF24_spiMultiByteTransfer(cmd, NULL, 1, true);
RF24_DEBUG(PSTR("RF24:read register, reg=%d, value=%d\n"), cmd & RF24_REGISTER_MASK, value);
return value;
}
LOCAL uint8_t RF24_spiByteTransfer(const uint8_t cmd)
{
return RF24_spiMultiByteTransfer(cmd, NULL, 0, false);
}